Superheater for tube-boilers.



PATENTED APR. 25, 1905.

W. SCHMIDT.

SUPERHBATER FOR TUBE BOILERS.

APPLIOATION FILED NOV. 21,1904.

2 SHEETS-SHEET 1.

rw m m {aw 1, fi m w W m f R n my M m WE T N 8 m m m HM 09 BJ %m mmm A]whim m W M m LN\H\\\H A AMW I \m mm M 3 N A Alli] P lull w W W v! v A)47/1 I g M Ks Mhi Q Q N W J MM R e 9 m$$w \K N e w hw my M N L Z wUnmet) STATES Patented April 25, 1905.

ATENT FFIQE.

SUPERHEATER FOR TUBE-BOILERS,

SPECIFICATION forming part of Letters Patent No. 788,169, dated April25, 1905.

Application filed November 21, 1904. Serial No. 233,645.

subject of the King of Prussia. German Emperor, and a resident ofilhelmshohe, near tassel, in the Province of Hesse-Nassau, GermanEmpire, have invented certain new and useful Improvements inSuperheaters for 'lube-Boilers, of which the following is an exactspecification.

.\ly invention relates to improvements in superheaters for tube-boilersand more especially to such boilers in which the tubes or llues serve atthe same time for anchoring the tube-boiler-body proper. In such boilersthe anchoring was diminished if the llucs are surrounded by steam thatis to say, if a superheater is put into the boiler proper the lines arethen not as usually surrounded by the water of the boiler, but they aresurrounded by steam, which does not lead the heat as well as water.Therefore when putting into the boiler a superheater surrounding thellues these latter cannot act and serve as anchoring as usually.

The subject of my present invention consists in avoiding thediszulvantages aforesaid, and the arrangement is such that the walls ofthe snperheater serve as anchors instead of the [hie-tubes. For thispurpose tubes are placed over some of the lines and form thesuper-heater and are so secured into the llues as to help anchoring,thereby discharging the lines as anchors. Through the annular spaceformed between the llucs and their surrounding mantle-tutws steam isled, which is thereby superheated and at the same time cools the llues.The mantle-tubes may surround their respective llues nearly on theirwhole length up to the lire-box, so that only some of the llues need beprovided with surrounding mantle-tubes for obtaining a considerablesuperheating of the steam. The latter can be led in a thin stream inequal or coun ter current through the annular space between themantle-tubes and lines, thereby cf- 'fecting a quick energeticsuperhcating regulable at will.

in order to make my invention more clear,

I refer to the accompanying drawings, in which- Figure l is alongitudinal section through a tube-boiler provided with a superheatcraccording to my invention. Fig. 2 is a front view of the boileraccording to Fig. 1. Fig. 3 shows a section through a set of llues withsurroum'ling mantle-tulws, illustrating three different kinds ofsecuring the mantle-tubes to the llues. Fig. 3" shows a side view of aset of llues.

In the drawings, Fig. 1, (1 is a tube leading the steam to besuperheated from the steamdome to the chamber 1), arranged at the backwall 11- of the boiler, it" being the front wall, at which the gasesenter the lines.

0' represents the boiler-fines.

c represents mantle-tubes surrounding the four upper rows of lines 0.

j" is a second chamber, into which the superheated steam enters and canbe led therefrom to the steam-cylimlers.

(Z is a partition serving as reacting-plate if the end of themantle-tulws c is secured to the llues by rolling.

In the uppermost device shown in Fig. 3 only the part c of the [Inc 0 issurrounded by a mantle-tube c. The [luc c is so rolled as to form asomewhat conical part, upon which 'the left-hand end of the mantle-tubec is rolled, so as to form rigid connection. The right-hand end of themantle-tube is secured to the back wall It and the wall a of chamber 1),whereas the right-hand end of the llue is fastened to the wall 11%. intothe annular space between c and c an intermediate tube i is inserted,which is fastened with its right hand end to the-wall w of chamber 1).The tube 'i creates return-channels within said annular space.

in the device shown in the middle of Fig. 3 the connection between c andc is accomplished in somewhat different manner from thatshown in thearrangement ust described. The left-hand end of the tube 0 is thickened,so as to facilitate the connection of the tubes 0 and c. Also the lowestdevice in Fig. 3 shows a similar kind of connection, in which c isprovided at the left-hand end with a j thickening 0, but indicates atthe same time i that in this case the partitiond can be spared, as to beseen from Fig. 3.

The two upper arrangements of Fig. 3 show an intermediate doublepartition i, whereas in the lowest device the partition i consists of asimple tube. This partition 6 is formed in the two upper devices of adouble tube, thereby preventing that the space between 0 and i cools thespace between "i and The operation is as follows: The steam entersthrough a the chamber 6, flows through space 0 between 0 and "L to theleft, and then between i and c to the right into chamberf, from wherethe steam, now superheated, can be led to its place of destination. Thesteam is by this way highly superheated and at the same time preventsthe flue part c to be damaged by the heat, whereas at the same time themantle-tube c helps anchoring.

In Fig. 3 the right-hand ends of the fines are somewhat enlarged,thereby equalizing a dangerous stretching and extending of the flues.Instead of simply enlarging the flue ends they may be further formed ofundulated sheet-iron.

The rolling on of the mantle-tube upon its flue may be effected in aconical form, there by guaranteeing a sure anchoring and a quick meansfor disconnecting. In Fig. 1 a cover 70 is shown, by means of which theflues,which are surrounded by mantle-tubes for superheating purposes,can be cut off from the smoke-box. This cover k may preferably beconnected to the blast-pipe, so that by opening this pipe the cover 7cis closed, whereas k is opened by cutting off the blast-pipethat is tosay, at the beginning of a drive. By

this means the action of the superheater is during the stopping cut outor as much as possible reduced.

Having thus fully described the nature of my invention, what I desire tosecure by Letters Patent of the United States is 1. In a tube-boiler,the combination of the boiler-body proper, of a plurality of flues,mantle-tubes surrounding some of the fines on part of their length andso fastened to their respective lines as to help anchoring, means forleading steam to be superheated and serving for cooling the saidflues,through the annular space between the flues and the surroundingmantle-tubes, substantially as and for the purpose set forth.

2. In a tube-boiler, the combination of the boiler-body proper, of aplurality of flues, mantle-tubes surrounding some of the fines on partof their length and each so fastened with one end to its respective flueas to help anchoring, means for leading steam to be su perheated andserving for cooling the said flues, through the annular space betweenthe flues and the surrounding mantle-tubes, substantially as and for thepurpose set forth.

3. In a tube-boiler, the combination of the boiler-body proper, of aplurality of flues, mantle-tubes surrounding some of the flues on partof their length and so fastened to their respective flues as to helpanchoring, an intermediate tube placed into the annular space betweensaid fiues and the surrounding mantle-tubes, so as to formreturn-channels, means for leading steam to be superheated and servingfor cooling the said flues,through the annular space between the finesand the surrounding mantle-tubes, substantially as and for the purposeset forth.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

WILHELM SCHMIDT.

Witnesses:

GUSTAV HENKEL, JULIUs FRANKE.

